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pcre_fullinfo.c
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1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4 
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7 
8  Written by Philip Hazel
9  Copyright (c) 1997-2009 University of Cambridge
10 
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14 
15  * Redistributions of source code must retain the above copyright notice,
16  this list of conditions and the following disclaimer.
17 
18  * Redistributions in binary form must reproduce the above copyright
19  notice, this list of conditions and the following disclaimer in the
20  documentation and/or other materials provided with the distribution.
21 
22  * Neither the name of the University of Cambridge nor the names of its
23  contributors may be used to endorse or promote products derived from
24  this software without specific prior written permission.
25 
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39 
40 
41 /* This module contains the external function pcre_fullinfo(), which returns
42 information about a compiled pattern. */
43 
44 
45 #define HAVE_CONFIG_H
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49 
50 #include "pcre_internal.h"
51 
52 
53 /*************************************************
54 * Return info about compiled pattern *
55 *************************************************/
56 
57 /* This is a newer "info" function which has an extensible interface so
58 that additional items can be added compatibly.
59 
60 Arguments:
61  argument_re points to compiled code
62  extra_data points extra data, or NULL
63  what what information is required
64  where where to put the information
65 
66 Returns: 0 if data returned, negative on error
67 */
68 
69 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
70 pcre_fullinfo(const pcre *argument_re, const pcre_extra *extra_data, int what,
71  void *where)
72 {
73 real_pcre internal_re;
74 pcre_study_data internal_study;
75 const real_pcre *re = (const real_pcre *)argument_re;
76 const pcre_study_data *study = NULL;
77 
78 if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
79 
80 if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
81  study = (const pcre_study_data *)extra_data->study_data;
82 
83 if (re->magic_number != MAGIC_NUMBER)
84  {
85  re = _pcre_try_flipped(re, &internal_re, study, &internal_study);
86  if (re == NULL) return PCRE_ERROR_BADMAGIC;
87  if (study != NULL) study = &internal_study;
88  }
89 
90 switch (what)
91  {
92  case PCRE_INFO_OPTIONS:
93  *((unsigned long int *)where) = re->options & PUBLIC_COMPILE_OPTIONS;
94  break;
95 
96  case PCRE_INFO_SIZE:
97  *((size_t *)where) = re->size;
98  break;
99 
100  case PCRE_INFO_STUDYSIZE:
101  *((size_t *)where) = (study == NULL)? 0 : study->size;
102  break;
103 
104  case PCRE_INFO_CAPTURECOUNT:
105  *((int *)where) = re->top_bracket;
106  break;
107 
108  case PCRE_INFO_BACKREFMAX:
109  *((int *)where) = re->top_backref;
110  break;
111 
112  case PCRE_INFO_FIRSTBYTE:
113  *((int *)where) =
114  ((re->flags & PCRE_FIRSTSET) != 0)? re->first_byte :
115  ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
116  break;
117 
118  /* Make sure we pass back the pointer to the bit vector in the external
119  block, not the internal copy (with flipped integer fields). */
120 
121  case PCRE_INFO_FIRSTTABLE:
122  *((const uschar **)where) =
123  (study != NULL && (study->flags & PCRE_STUDY_MAPPED) != 0)?
124  ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
125  break;
126 
127  case PCRE_INFO_MINLENGTH:
128  *((int *)where) =
129  (study != NULL && (study->flags & PCRE_STUDY_MINLEN) != 0)?
130  study->minlength : -1;
131  break;
132 
133  case PCRE_INFO_LASTLITERAL:
134  *((int *)where) =
135  ((re->flags & PCRE_REQCHSET) != 0)? re->req_byte : -1;
136  break;
137 
138  case PCRE_INFO_NAMEENTRYSIZE:
139  *((int *)where) = re->name_entry_size;
140  break;
141 
142  case PCRE_INFO_NAMECOUNT:
143  *((int *)where) = re->name_count;
144  break;
145 
146  case PCRE_INFO_NAMETABLE:
147  *((const uschar **)where) = (const uschar *)re + re->name_table_offset;
148  break;
149 
150  case PCRE_INFO_DEFAULT_TABLES:
151  *((const uschar **)where) = (const uschar *)(_pcre_default_tables);
152  break;
153 
154  /* From release 8.00 this will always return TRUE because NOPARTIAL is
155  no longer ever set (the restrictions have been removed). */
156 
157  case PCRE_INFO_OKPARTIAL:
158  *((int *)where) = (re->flags & PCRE_NOPARTIAL) == 0;
159  break;
160 
161  case PCRE_INFO_JCHANGED:
162  *((int *)where) = (re->flags & PCRE_JCHANGED) != 0;
163  break;
164 
165  case PCRE_INFO_HASCRORLF:
166  *((int *)where) = (re->flags & PCRE_HASCRORLF) != 0;
167  break;
168 
169  default: return PCRE_ERROR_BADOPTION;
170  }
171 
172 return 0;
173 }
174 
175 /* End of pcre_fullinfo.c */